What's the Matter?
Ketchup, maple syrup and juice are all examples of which state of of matter? (Solid, liquid or gas)
Liquid
What's it called when a solid becomes a liquid?
Melting
Matter has two super important jobs - it has ______ and takes up _____
mass
space
Is shredding paper a physical or chemical change?
Physical
Is cutting down a tree a physical or chemical change?
Physical - the chopped wood is still wood.
Which state of matter always holds it's shape?
Solids
Using water to make ice cubes is an example of what?
Freezing
An empty water bottle weighs ____ than a full one because the water takes up ______ and has ______
less
space
mass
Is digesting food a physical or chemical change?
chemical
What chemical changes are involved in baking a cake?
Eggs are cooked into the cake.
Baking soda reacts with the ingredients causing the cake to rise.
Which state of matter has particles that move fast and freely?
gas
What are the freezing points and boiling points of water? (Temperatures)
Freezing - 0'C
Boiling - 100'C
_______________ energy is the heat that makes matter change state.
Thermal
When talking about chemical and physical changes, which is reversible and which is not?
Chemical changes are not (they're irreversible)
What is an example of a chemical change that could happen to a tree?
Burning the logs is an example of a chemical change.
Which state of matter has no defined shape and can take the shape of whatever container it's in?
liquid
In our experiment we watched water vapour change into water droplets. What was this an example of?
Condensation
Changing shape, size or state without creating a new __________ is a physical change.
substance
When mixing things together, bubbles are a sign of which kind of change?
Chemical
Excessively cutting down trees is called what?
Deforestation
Can you match each definition with the correct state of matter? (Liquid, Solid or Gas)
a) Keeps it's shape, tightly packed particles and cannot be poured.
b) Expands to fill it's container, can be compressed and has widely spaced particles
c) Takes the shape of it's container, can be poured, particles are loosely packed together
a) Solid
b) Gas
c) Liquid
Sublimation occurs when a solid changes into a gas. What is the one example we know of to explain sublimation?
Dry Ice
The handle of a frying pan is usually made of ________ or _______ because these materials do not __________ heat ________.
plastic
rubber
conduct
well
Is frying an egg a chemical or physical change? Explain how you know.
It's a chemical change because there is no way to get the egg back into it's original uncooked form.
Why might environmental activists want to limit paper processing?
To prevent deforestation and to protect habitats and ecosystems.